Recent plasma control progress on EAST

In recent 2 years, various algorithms to control plasma shape, current and density have been implemented or improved for EAST tokamak. These plasma control performances have been verified by either simulated or actual experimental operation, and thus plasma control basis has been established for the...

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Bibliographic Details
Published in:Fusion engineering and design 2012-12, Vol.87 (12), p.1887-1890
Main Authors: Xiao, B.J., Yuan, Q.P., Humphreys, D.A., Walker, M.L., Hyatt, A.W., Leuer, J.A., Jackson, G.L., Mueller, D., Penaflor, B.G., Pigrowski, D.A., Johnson, R.D., Welander, A.S., Zhang, R.R., Luo, Z.P., Guo, Y., Xing, Z., Zhang, Y.
Format: Article
Language:English
Subjects:
Algorithms
Breakdown
Computer simulation
Control systems
Density
EAST tokamak
Equilibrium reconstruction
Failure
Plasma control
Strikes
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Summary:In recent 2 years, various algorithms to control plasma shape, current and density have been implemented or improved for EAST tokamak. These plasma control performances have been verified by either simulated or actual experimental operation, and thus plasma control basis has been established for the long pulse operation and high performance H-mode plasma operation with low hybrid wave (LHW) and ion cyclotron resonance frequency (ICRF) heating. Startup simulation has been done by using TOKSYS code for the plasma breakdown in either 3.1Wb or 4.5Wb initial poloidal flux state and the scenarios proved to be robust and used for routine operation. Various shape configurations have been well feedback controlled by using ISOFLUX limited, double-null or single null algorithms based on RTEFIT equilibrium reconstruction. For the long pulse operation, strike point control and magnetics drift compensation have been implemented in the plasma control system (PCS). To improve the operation safety and efficiency, the verification of magnetic diagnostics before plasma breakdown has been demonstrated adequate to prevent a discharge in case of key sensor failure.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2012.06.013